Questions and Answers
The action that moves the scapula towards the head is called __________.
elevation
Which movement results after the contraction of the serratus anterior muscle?
scapular protraction and rotation
Which movement is not associated with the scapula?
opposition
The two heads of the biceps brachii muscle converge distally to insert on the __________.
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The coracobrachialis muscle originates on the __________.
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The posterior scapular muscle that crosses the glenohumeral joint is the __________.
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The __________ is a prime mover of the glenohumeral joint during flexion.
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Which of the following muscles assists during extension of the glenohumeral joint, but is not as a prime mover?
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Without lateral rotation of the humerus by the teres minor and infraspinatus muscles, the maximum angle of abduction by the deltoid would be __________.
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Abduction requires the action of two muscles, and adduction requires the action of __________.
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Which muscle is not part of the rotator cuff?
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Downward dislocation of the humerus from the glenohumeral joint when carrying weight is prevented by the __________.
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The angle of which muscle prevents the humeral head from sliding upward out of the joint as the arm is raised?
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Study Notes
Movement of the Scapula
- Elevation moves the scapula towards the head.
- Serratus anterior muscle contraction causes scapular protraction and rotation.
- Opposition is not a movement associated with the scapula.
Biceps Brachii and Associated Muscles
- The biceps brachii muscle has two heads that converge to insert on the radial tuberosity.
- Coracobrachialis muscle originates from the coracoid process of the scapula.
- Teres major is a posterior scapular muscle that crosses the glenohumeral joint.
Glenohumeral Joint Actions
- Deltoid acts as a prime mover during flexion of the glenohumeral joint.
- Teres major assists in glenohumeral joint extension but is not a prime mover.
- Without lateral rotation from teres minor and infraspinatus, deltoid's maximum abduction is limited to 90 degrees.
Muscle Actions in Abduction and Adduction
- Abduction requires two muscles, while adduction involves four muscles.
Rotator Cuff and Joint Stability
- Teres major is not part of the rotator cuff.
- Supraspinatus muscle prevents downward dislocation of the humerus during weight-bearing.
- Subscapularis maintains the humeral head position, preventing upward sliding when the arm is raised.
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Description
Test your knowledge on the movements associated with the scapula and related muscle actions in this AP1 quiz. Understand key terms like elevation and scapular protraction while identifying movements not related to the scapula. Perfect for anatomy students and enthusiasts!
